I have collided with unknown vessel.

我船和一艘不明船相碰。

youdao

The Museum of the Unknown is a vessel.

未知博物馆是一个容器。

youdao

The test shows that the non-equality and unknown stress distribution of weld joint, which can be promoted by extra-load, is the key to make sure the steel pressure vessel for safety.

结果表明，焊接接头的应力不均匀性和不确定性是影响钢制压力容器安全性的关键，采用加载法可以有效地改善这种非均匀应力分布状况。

youdao

Not so lucky were the shipwrecked crew of an unknown vessel washed up in 1860.

BBC: The ghostly shore of Namibia��s Skeleton Coast

"The potential for a pollution incident is unknown at this time, but officials have limited concerns about any biological threats due to the length of time the vessel has been at sea, " the Coast Guard said in a statement.

CNN: U.S. Coast Guard sinks Japanese boat washed away by tsunami